Your issue is something actually in the data set.
One thing you might check is the file encoding, language character set used, by checking the details tab of the data set properties in the SAS file explorer or running Proc contents on the data set.
See if the file encoding matches your system setting.
Then run this code:
proc options group=(languagecontrol);
run;
And compare the result in the log for the options Encoding and the DBCS related options.
That type of error can indicate that you have some sort of double-byte character set in the data when the options are not set to handle them.
I would suspect yet another issue with running the proper setup for the training materials.